“首先我们培养习惯，后来习惯塑造我们”讲的是（　　）

2×（－$\frac{1}{2}$）的结果是（     ）

写作

假设上周六你们班组织了一次活动，请根据下列提示写一篇60词左右的短文，可适当拓展。

　　参加人员 全体师生

　　活动内容 参观太空博物馆，看了许多有关宇宙飞船的图片，试穿太空服，见到了杨利伟

　　出发时间 上个星期六早晨七点三十分

　　集合地点 学校大门口

　　交通工具 公共汽车

　　参考词汇：太空博物馆the space museum　宇宙飞船 spacecraft　试穿 try on　太空服space suits　学校大门口schoolgate

根据短文内容，选择正确答案。
   It’s Sunday morning．There are many people in the park，some boys  are playing basketball．There are some girls under a big tree．They’re singing and dancing．What are those women doing? They are drinking tea．Look at the woman in a blue coat．Who's she? She’s my mother．She is talking to Lin Feng．Lin Feng is her student．He is a good student．He studies hard．He’s good at all the subjects． And he's friendly to all his teachers and his friends．